breakingatom.com 的前十大競爭對手

periodictable.com

the definitive online periodic table reference site including technical data, and photographs and descriptions of thousands of samples of the chemical elements.

pubchem.ncbi.nlm.nih.gov

PubChem is the world's largest collection of freely accessible chemical information. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more.

chem.libretexts.org

The LibreTexts libraries collectively are a multi-institutional collaborative venture to develop the next generation of open-access texts to improve postsecondary education.

lenntech.com

lenntech designs, builds and installs a wide range of odour treatment, water purification and air filtration products using uv, ozone, ecosorb, drum filtration. also cooling towers.

americanelements.com

American Elements: The Materials Science Company™ | Certified bulk & lab quantity manufacturer & supplier of metals, chemicals, nanoparticles & other advanced materials.

crystalmaker.com

crystalmaker software ltd: crystal and molecular structures, modelling, visualisation software plus diffraction pattern simulation for macos and windows

positivephysics.org

Engaging curriculum for Physics, Chemistry, Biology & more!

chemguide.uk

main menu of a site aimed to help advanced level chemistry students to understand chemistry

studimup.de

Studimup ist ein Bildungsunternehmen, welches sich auf Mathematik spezialisiert und versucht diese so einfach wie Möglich mit verschiedenen Materialien zu erklären.

efficientengineer.com

Internal stresses develop within any body in response to externally applied loads. At any given point within the body, these internal stresses have components acting in both the normal and the shear directions.  The normal and shear stress components are shown in the image below acting on a 3D stress element that represents a single […]